Stroker advice
A better explanation for sure.
Obviously there's tons of variables but using drag racing to narrow it down but any aggressive part/full throttle driving this applies to. Gonna assume two well matched cars of same weight producing near identical 1/4 mile times, mph and very similar at all parts of the track but one has a 340 and the other is a 440.
Now these cars will be putting very similar hp to the ground as each other at the same speeds and the same parts on the track, to be performing the same. The plots of each hp curves in each gear to the ground on the track through on the run will be very similar. Since tire is a constant size, so rpm per mph is fixed, along with hp curve in each gear, so to tq will be then. So the performance to tire is kind of fixed and is the end result and so no matter what comes before it (drivetrain) has to equal out. So each engines with different powerband rpms and torque #'s and gearing performing very similarly has to equal out to the tires to have similar hp/tq curves throughout the run. To perform similarly on track street etc..
Now let's bring some variability into it, now not all cars weigh the same, with still same overall hp curves to the track the hp numbers will be different now but will be within similar power to weight ratios at each point of the curve to give similar performance.
Now let's say there's a difference in weight and different hp curves with different amounts of gearing but similar power et mph, there track curves will vary throughout the run but hp averages will be similar but the relative ratios of tq rpms and gearing will workout to give similar hp average to the tire throughout the run. Etc...
There's a mathematical relationship between gearing rpm and tq, NA tq is highly dependent on cid and so is rpm for a given hp and cid so ultimately displacement and gearing are mathematical related for a given performance.
Does that mean for a given cid e.t. and mph they all need same gear/tire ratio, no cause there's also the variable of efficiency, which is lbs-ft per cid which for most non highly competitive racing 1 to 1.4 gross tq:cid above 1.3 is doing incredibly well and most fall short. But engines of very similar hp and tq:cid but of different sizes and rpm powerbands like 340 vs 440, the ratios of rpm tq and gearing will be very mathematical similar.